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Growth and physical characterization of polygon prismatic hollow Zn-ZnO crystals

机译:多边形棱柱形空心Zn-ZnO晶体的生长和物理表征

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摘要

A hierarchical polygon prismatic Zn-ZnO core-shell structure was grown on silicon by combining liquid-solution colloidals together with the vapor-gas growth process. Zn colloidals with a diameter of 5-10 nm synthesized from Zn(ClO4)(2) precursor solution were used as nucleation seeds for the growth of Zn polygon prismatic nanocrystals. Depending on carrier gas and annealing conditions, the polygon prismatic Zn crystals having morphology from hollow to dense configuration can be manipulated. Moreover, after prolonged thermal treatment at 300-400 degrees C, polygon prismatic hollow ZnO-Zn crystals with a dimension from nanometer to micrometer can be obtained. The room-temperature photoluminescence spectra show that the hollow ZnO-Zn crystals have a weak ultraviolet (UV) emission at 380 nm and a strong green emission at 500 nm. However, the intensity of the UV emission can be improved by postannealing the Zn-ZnO core-shell structure in an oxygen atmosphere to form hollow ZnO crystals.
机译:通过将液体溶液胶体与蒸气-气体生长过程结合在一起,在硅上生长出分层的多边形棱柱形Zn-ZnO核-壳结构。由Zn(ClO4)(2)前体溶液合成的直径5-10 nm的Zn胶体用作成核种子,用于Zn多边形棱柱形纳米晶体的生长。取决于载气和退火条件,可以操纵具有从中空到致密构造的形态的多棱柱状Zn晶体。此外,在300-400℃下长时间的热处理之后,可以获得尺寸从纳米到微米的多角形中空ZnO-Zn晶体。室温光致发光光谱表明,中空的ZnO-Zn晶体在380 nm处具有较弱的紫外线(UV)发射,在500 nm处具有较强的绿色发射。但是,可以通过在氧气气氛中对Zn-ZnO核-壳结构进行后退火以形成空心ZnO晶体来提高UV发射的强度。

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